I used six updater to install ACE mod and ACRE. Six updater also installed the required CBA_CO as well as JayArma2Lib mods. I have Combined Ops installed with Steam by the way.

When I launch Arma and start scenario ACE2 demo mission in single player, I open the ace ammo magic box by pressing G and I get this error message:
Picture \idi\clients\acre\addons\sys_mc220r\data\343_icon.paa not found
I click ok and the gear menu opens. The menu is very laggy and there are a bunch of acre radio's that appear several times.
Example:
AN/PRC-119
AN/PRC-119
AN/PRC-119
AN/PRC-119
AN/PRC-119
etc

Arma 2 Combined Ops installed with Steam
Arma 3 without realism mods sucks because AI headshot you through a bush from 1km away using iron sights.